Steel battery cap body and lithium battery

Abstract

The utility model relates to the field of batteries, in particular to a steel battery cap body and a lithium battery, the steel battery cap body comprises a bottom surface, a convex surface and a welding part, the bottom surface abuts against a battery roll core, the outer ring of the bottom surface is connected with a battery shell, and the convex surface is arranged on the bottom surface. The convex surface is formed by protruding the part of the center of the bottom surface back to the battery roll core, the periphery of the convex surface is provided with scribed lines so that the whole convex surface forms an air passing port during pressure relief, and the welding part is formed by embedding the part of the bottom surface into the convex surface along the radial direction; and the bottom surface is connected with the battery roll core through the welding part. The technical problem that in the prior art, the air passing amount of a lithium battery cap body is not large enough is solved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a steel battery cap and a lithium battery. Background Art

[0002] Application number CN2023204765488, patent name A new type of lithium battery cap, discloses a new type of lithium battery cap, including a cover plate and a welding area, an explosion-proof score line area is formed on the cover plate, a protective ring is formed at the outer edge of the cover plate, the ring surface of the protective ring is higher than the explosion-proof surface of the explosion-proof score line area, the welding area is formed by stamping a part of the cover plate toward the inside of the lithium battery, the welding surface of the welding area is lower than the explosion-proof surface of the explosion-proof score line area, and the welding area is directly connected to the roll core of the lithium battery, which simplifies the lithium battery assembly process and solves the technical problem that the score line of the lithium battery is easily affected by the pressure inside and outside the battery and fails.

[0003] As the use of lithium batteries becomes more and more extensive, the requirements for lithium battery caps are getting higher and higher, such as the requirements for the gas flux of lithium battery caps are getting higher and higher. Although the solution given in the above patent can make the engraved lines of the lithium battery cap not be affected by the internal and external pressures of the battery, the gas holes formed after the three circles of the engraved lines are broken are still not large enough, and cannot meet the market's increasingly high requirements for the gas flux of lithium battery caps. Utility Model Content

[0004] In order to solve the technical problem in the prior art that the gas flow rate of the lithium battery cap is not large enough, the present application proposes a steel battery cap and a lithium battery to solve the above technical problem.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The utility model provides a steel battery cap body, comprising: a bottom surface, the bottom surface is against the battery coil core, and the outer circle of the bottom surface is connected to the battery shell; a raised surface, the raised surface is formed by the part of the center of the bottom surface protruding away from the battery coil core, and the periphery of the raised surface is provided with engraved lines so that the entire raised surface is formed as an air outlet during pressure relief; a welding part, the welding part is formed by the part of the bottom surface being embedded in the raised surface along the radial direction, and the bottom surface is connected to the battery coil core through the welding part.

[0007] The bottom surface of the steel battery cap body of the utility model, especially the welding part of the bottom surface, can be used to press the winding core, improve the stability of the lithium battery, and extend the service life of the lithium battery. At the same time, the periphery of the entire raised surface is provided with engraved lines so that the entire raised surface is formed as a gas outlet during pressure relief, which greatly increases the gas flow rate of the battery during pressure relief, thereby solving the technical problem of insufficient gas flow rate of the lithium battery cap body in the prior art while ensuring the stability of the battery.

[0008] Furthermore, an exhaust hole for chemical formation is formed at the center of the convex surface.

[0009] Furthermore, a step covering the exhaust hole is formed at the center of the raised surface facing away from the battery coil core, and a sealing block is embedded in the step.

[0010] Furthermore, the outer ring of the bottom surface is formed with a flange matching the shape of the battery shell.

[0011] Another aspect of the present invention provides a lithium battery, comprising the above-mentioned steel battery cap body.

[0012] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0013] The bottom surface of the steel battery cap body of the utility model, especially the welding part of the bottom surface, can be used to press the winding core, improve the stability of the lithium battery, and extend the service life of the lithium battery. At the same time, the periphery of the entire raised surface is provided with engraved lines so that the entire raised surface is formed as a gas outlet during pressure relief, which greatly increases the gas flow rate of the battery during pressure relief, thereby solving the technical problem of insufficient gas flow rate of the lithium battery cap body in the prior art while ensuring the stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of the steel battery cap of the utility model;

[0015] Figure 2 It is a cross-sectional view of the steel battery cap body of the utility model.

[0016] Among them: 1-bottom surface; 2-raised surface, 21-marked line; 3-welding part; 4-exhaust hole; 5-step; 6-flange. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] like Figure 1-2As shown, the utility model provides a steel battery cap body, the material of the steel can be 46# steel, including a bottom surface 1, a raised surface 2 and a welding portion 3, the bottom surface 1 is against the battery roll core, the outer circle of the bottom surface 1 is connected to the battery shell, the raised surface 2 is formed by the part of the center of the bottom surface 1 protruding back to the battery roll core, the outer periphery of the raised surface 2 is provided with a score line 21 so that the entire raised surface 2 is formed as a gas outlet during pressure relief, the welding portion 3 is formed by a part of the bottom surface 1 being embedded in the raised surface 2 along the radial direction, the bottom surface 1 is connected to the battery roll core through the welding portion 3, and specifically, the bottom surface 1 can be connected to the roll core by a penetration welding method at the welding portion 3.

[0019] The steel battery cap body of the utility model, the bottom surface 1, especially the welding portion 3 of the bottom surface 1, can be used to press the winding core, improve the stability of the lithium battery, and extend the service life of the lithium battery. At the same time, the periphery of the entire raised surface 2 is provided with a score line 21 to form the entire raised surface 2 as a gas outlet during pressure relief, which greatly increases the gas flow rate of the battery during pressure relief, thereby solving the technical problem of insufficient gas flow rate of the lithium battery cap body in the prior art while ensuring the stability of the battery.

[0020] In a specific embodiment of the present invention, a gas exhaust hole 4 for formation is formed at the center of the convex surface 2, which can be used for gas exhaust during the test.

[0021] In a specific embodiment of the present invention, a step 5 covering the exhaust hole 4 is formed at the center of the raised surface 2 facing away from the battery coil core, and a sealing block is embedded in the step 5 to obtain a flat battery cap connection surface.

[0022] In a specific embodiment of the present invention, the outer ring of the bottom surface 1 is formed with a flange 6 matching the shape of the battery housing to facilitate positioning and assembly with the battery housing.

[0023] Another aspect of the utility model provides a lithium battery, comprising the above-mentioned steel battery cap body.

[0024] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A steel battery cap, characterized in that: include: A bottom surface (1), the bottom surface (1) abuts against the battery coil core, and the outer ring of the bottom surface (1) is connected to the battery housing; A raised surface (2), the raised surface (2) being formed by a portion of the center of the bottom surface (1) protruding away from the battery winding core, and a score line (21) being arranged on the periphery of the raised surface (2) so that the entire raised surface (2) forms a gas outlet when pressure is released; A welding portion (3), wherein the welding portion (3) is formed by partially embedding a portion of the bottom surface (1) into the convex surface (2) along a radial direction, and the bottom surface (1) is connected to the battery winding core via the welding portion (3).

2. The steel battery cap according to claim 1, characterized in that: An exhaust hole (4) for chemical formation is formed at the center of the convex surface (2).

3. The steel battery cap according to claim 2, characterized in that: A step (5) covering the exhaust hole (4) is formed at the center of the convex surface (2) facing away from the battery coil core, and a sealing block is embedded in the step (5).

4. The steel battery cap according to claim 1, characterized in that: The outer ring of the bottom surface (1) is formed with a flange (6) matching the shape of the battery shell.

5. A lithium battery, characterized in that: It comprises the steel battery cap body as described in any one of claims 1 to 4.

Images